I am trying to run a cross level moderation with 3 control variables. I am using the sintax provided in the Mplus manual.

However, I keep getting the following error message: *** ERROR in MODEL CONSTRAINT command A parameter label or the constant 0 must appear on the left-hand side of a MODEL CONSTRAINT statement. Problem with the following: YHIGH) =

I am also unable to use the variable center command because MPlus keeps saying: *** ERROR in DEFINE command Error in assignment statement for CENTER